Mazda 2007 CX-9, Service Highlights, Page: 522 / 614

ENTERTAINMENT
09-20–12
AUTO LEVEL CONTROL (ALC) OPERATION
id092000106800
•
The audio unit changes the volume automatically based on the vehicle speed signal sent from the instrument
cluster.
•
The ALC function is divided into four modes that can be used effectively to match the driving conditions.
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AUDIOPILOT OUTLINE
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•
Measures the driving noise level inside the vehicle with a specialized microphone, and the amplifier adjusts the
volume in accordance with the degree of noise masking the music component. Due to this, passengers can
enjoy music at a constantly perceived volume level regardless of the noise level.
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HIGHER VEHICLE SPEED
VEHICLE SPEED SIGNAL
LOWER VEHICLE SPEED
VEHICLE SPEED SIGNAL
AUDIO UNIT (BASE UNIT)
ALC
CIRCUIT
ALC
CIRCUIT
AUDIO UNIT (BASE UNIT)
POWER
AMPLIFIER
POWER
AMPLIFIER
SPEAKER
SPEAKER
HIGHER VOLUME
NORMAL VOLUME
acxuun00000364
Mode Condition
ALC function cancelled
Outside road noise low
Outside road noise slightly high
Outside road noise high
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